http://build.fhir.org/search.html#combining describes three ways of "combining" search parameters, which I'd summarize as:

• "AND search parameter" – e.g., Patient?language=FR&language=NL for French/Dutch bilingual patients
• "OR search parameter" – e.g., Patient?language=FR,NL for patients who speak at least one of French or Dutch
• "Composite search parameter" – e.g., Group?characteristic-value=gender$mixed for Groups with a single characteristic that means "gender: mixed" (rather than, say, one characteristic meaning "gender: male" and another meaning "preferred Chex cereal format: mixed", which you might inadvertently match with a non-composite query like{{Group?characteristic=gender&value=mixed}}).

... but these definitions are all grouped under a heading called "Composite Search Parameters". The element ID ("#combining") is clearer, since "AND" and "OR" parameters are not examples of "composite" search parameters. 

We should:

1. Rename this section to "Combining Search Parameters"
2. Eliminate the introductory sentences "Composite search parameters support joining single values with a $. For example, the result of the search operation is the intersection of the resources that match the criteria specified by each individual search parameter. " which are mis-placed and belong in the bottom paragraph of the section (but they're already effectively communicated by the text present in the bottom paragraph).